{% for id,name in trays.items(): %}
<div tray="{{id}}" class="tray">
    <h5>{{name}}</h5>
    <div class="progress">
        <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0"
             aria-valuemax="100" style="width: 60%;"></div>
    </div>
</div>
{% endfor %}